The easiest way to find the leak spots on the roof is to go up to the stairs with the torch and look for the evidence. You can find water stains, water black marks or mold. If you still can’t find the leak then call for the helper and go up to the roof with the garden hose. Stay helper inside the house and start low, soaking the area above where the leak appears in the house. Tell your helper to yell when a drip becomes visible. This process can take an hour to detect the leak location.